package edu.sias.hyznxfapi.face.baidu.utils;

import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Base64;

/**
 * Base64 工具类
 */
public class Base64Util {
    private static final char last2byte = (char) Integer.parseInt("00000011", 2);
    private static final char last4byte = (char) Integer.parseInt("00001111", 2);
    private static final char last6byte = (char) Integer.parseInt("00111111", 2);
    private static final char lead6byte = (char) Integer.parseInt("11111100", 2);
    private static final char lead4byte = (char) Integer.parseInt("11110000", 2);
    private static final char lead2byte = (char) Integer.parseInt("11000000", 2);
    private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};

//    public Base64Util() {
//    }

//    public static String encode(byte[] from) {
//        StringBuilder to = new StringBuilder((int) ((double) from.length * 1.34D) + 3);
//        int num = 0;
//        char currentByte = 0;
//
//        int i;
//        for (i = 0; i < from.length; ++i) {
//            for (num %= 8; num < 8; num += 6) {
//                switch (num) {
//                    case 0:
//                        currentByte = (char) (from[i] & lead6byte);
//                        currentByte = (char) (currentByte >>> 2);
//                    case 1:
//                    case 3:
//                    case 5:
//                    default:
//                        break;
//                    case 2:
//                        currentByte = (char) (from[i] & last6byte);
//                        break;
//                    case 4:
//                        currentByte = (char) (from[i] & last4byte);
//                        currentByte = (char) (currentByte << 2);
//                        if (i + 1 < from.length) {
//                            currentByte = (char) (currentByte | (from[i + 1] & lead2byte) >>> 6);
//                        }
//                        break;
//                    case 6:
//                        currentByte = (char) (from[i] & last2byte);
//                        currentByte = (char) (currentByte << 4);
//                        if (i + 1 < from.length) {
//                            currentByte = (char) (currentByte | (from[i + 1] & lead4byte) >>> 4);
//                        }
//                }
//
//                to.append(encodeTable[currentByte]);
//            }
//        }
//
//        if (to.length() % 4 != 0) {
//            for (i = 4 - to.length() % 4; i > 0; --i) {
//                to.append("=");
//            }
//        }
//
//        return to.toString();
//    }

    public Base64Util() {
    }

    public static String encode(byte[] from) {
        // 使用 Java 的 Base64 编码器将字节数组编码为 Base64 字符串
        return Base64.getEncoder().encodeToString(from);
    }

    public static void main(String[] args) {
        try {
            // 读取图片文件为字节数组
            byte[] imageBytes = Files.readAllBytes(Paths.get("C:\\Users\\86184\\Pictures\\Screenshots\\屏幕截图 2024-03-08 180742.png"));

            // 将字节数组编码为 Base64 字符串
            String base64Image = encode(imageBytes);

            // 打印 Base64 字符串
            System.out.println(base64Image);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
